package com.hy.security.security;

import io.jsonwebtoken.CompressionCodecs;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * Token处理
 */
@Component
public class TokenHandler {
    //token有效时长1天
    private long tokenEcpiration = 24*60*60*1000;
    //编码秘钥
    private String tokenSignKey = "secret";

    //使用jwt根据用户名生成token
    public String createToken(String username) {
        String token = Jwts.builder()
                .setSubject(username)
                .setExpiration(new Date(System.currentTimeMillis()+tokenEcpiration))
                .signWith(SignatureAlgorithm.HS512, tokenSignKey)
                .compressWith(CompressionCodecs.GZIP)
                .compact();
        return token;
    }

    //根据token字符串解析获得用户信息
    public String getUserInfoFromToken(String token) {
        String userInfo = Jwts.parser()
                .setSigningKey(tokenSignKey)
                .parseClaimsJws(token)
                .getBody()
                .getSubject();
        return userInfo;
    }


}
